This Practice Note provides high-level guidance on the administration regimes for UK banks, investment firms, building societies and investment banks under: • the Banking Act 2009 (BA 2009) • the Building Societies (Insolvency and Special Administration) Order 2009, SI 2009/805 (Building Societies Order 2009), and • the Investment Bank Special Administration Regulations 2011, SI 2011/245 (IB Regulations 2011) Banking Act 2009 BA 2009 was intended to improve the resilience of the UK financial systems, and support financial stability by strengthening depositor protection and providing mechanisms for dealing with banks in financial difficulties. Among other things, BA 2009 introduced a special resolution regime (SRR).The SRR grants powers to HM Treasury, the Prudential Regulation Authority (PRA), the Financial Conduct Authority (FCA) and the Bank of England (BoE) for dealing with banks, banking group companies, investment firms, building societies and UK branches of third-country institutions in financial difficulties. Central counterparties (CCPs) are subject to a separate special resolution regime under section 57 of the Financial Services and Markets Act 2023 (FSMA 2023)